Croatian bauxites are long known for their chemical and physical diversity arisen from characteristic origin emplacement within the area of Adriatic–Dinaric carbonate platform (ADCP). They include eight horizons spanning period between Upper Triassic (Carnian) Miocene, formed on subaerially exposed paleoenvironments. The bauxite genesis is recorded in geochemical composition as a unique signatu...

It is important to elucidate the role of surface areas and pore volumes hierarchical zeolites understand their behavior as catalysts. Micro-and mesopore MFI (Mobil Five zeolites) were assessed following several methods: (i) N2 adsorption at 77 K using classical corrected t-plot analyses methods, (ii) pre-adsorption n-nonane was followed by study K, (iii) non-local-density functional theory (NLD...

Abstract Purpose Rice is a staple crop worldwide and silicon (Si) hyperaccumulator with Si levels reaching 5–10% of its mass; this can result in desilication Si-deficiency if plant residues are not managed correctly. also uniquely subject to arsenic (As) cadmium (Cd) contamination depending on soil conditions. Our goal quantify the effects rice husk (a Si-rich milling byproduct) amendments diff...

The Lyagkomina occurrence of kyanite amphibolites (the Belomorian Province the Fennoscandian Shield) is confined to an amphibolite boudin among kyanite-garnet-biotite and garnet-biotite gneisses Chupa Sequence. main rock types at are meso- melanocratic garnet-kyanite with large (more than 1 cm in length) kyanite-garnet small kyanite. There also leucocratic garnet-biotite-amphibole-plagioclase r...

A net of pegmatite veins crosscut gneiss and dismembered ophiolitic ultramafic rocks are abundant in the Migif-Hafafit culmination area, South Eastern Desert, Egypt. Some these pegmatites corundum-bearing. Corundum-bearing studied eight localities around complex. The present study aims to integrate field investigation, whole rock corundum chemistry, remote sensing studies, conventional methods ...

Highly weathered soils are widepsread in the humid tropics. These deep, clayey, and reddish contain scant amounts of nutrients like Si due to excessive leaching, heavy desilication-aluminization, erosion owing their slope gradient position. However, few investigations have been published terms nature, characteristics, nutrient status, especially for geologically young Philippine islands. This s...

Crude bio-oil from fast pyrolysis of biomass has a high oxygen content and acidity, leading to problems with corrosion polymerization/instability. In this work, the catalytic vapor phase upgrading acetol, compound that is present in concentrations vapors, was investigated over three microporous HZSM-5 four mesoporous catalysts different levels acidity mesoporosity. All were steam-treated prior ...

High-alumina minerals refer, in this paper, to Al-rich, normal sedimentary phases, including gibbsite, boehmite, diaspore, possibly "proto-diaspore" and "proto-alunite", "Al-chlorite", and corundum, in association with kaolin minerals. They may be derived from any common Al-containing rock. Processes of origin include direct bauxitization of non-clay silicate minerals and rocks, and the desilic...